The square of a minus 4a is equal to?

Given a + B = - 2, A-B = 2, decompose (a 2 + B 2-1) 2-4 A 2B 2 first, and then evaluate

The original formula = (A2 + b2-1-2ab) (A2 + b2-1 + 2Ab) = (a + B + 1) (a + B-1) (a-b + 1) (a-b-1) substituting a + B = - 2, A-B = 2, the original formula = 9

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